Abstract
This paper investigates the propagation of a plastic zone resulting from fluid injection in a weakly consolidated porous medium with dilatant behavior. It is assumed that the rock behaves as a Mohr-Coulomb elasto-plastic material with different mobility and diffusivity depending on whether it is elastic or yielding. More specifically, the plane strain problem of a point source injecting fluid, at constant rate, in an infinite domain is considered. Under these assumptions, the absence of any characteristic length implies the existence of a self-similar solution. It is shown that this solution consists of a plastic zone growing as the square root of time and is characterised by a constant pore pressure at the elasto-plastic boundary. Depending on the magnitude of the injection rate, three yielding regimes exists. Finally, the paper concludes by investigating the conditions under which a tensile fracture could initate in the vicinity of the injection point.
Original language | English (US) |
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Title of host publication | Poromechanics 2017 - Proceedings of the 6th Biot Conference on Poromechanics |
Editors | Patrick Dangla, Jean-Michel Pereira, Siavash Ghabezloo, Matthieu Vandamme |
Publisher | American Society of Civil Engineers (ASCE) |
Pages | 1952-1959 |
Number of pages | 8 |
ISBN (Electronic) | 9780784480779 |
DOIs | |
State | Published - 2017 |
Event | 6th Biot Conference on Poromechanics, Poromechanics 2017 - Paris, France Duration: Jul 9 2017 → Jul 13 2017 |
Publication series
Name | Poromechanics 2017 - Proceedings of the 6th Biot Conference on Poromechanics |
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Other
Other | 6th Biot Conference on Poromechanics, Poromechanics 2017 |
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Country/Territory | France |
City | Paris |
Period | 7/9/17 → 7/13/17 |
Bibliographical note
Publisher Copyright:© ASCE.